The analogy applies to companies and brands. It is much easier to have stake in and pilot the direction of a small company than a large one. Big companies are much more difficult to steer and big brands much more difficult to reposition. One man or woman will fight an uphill battle if he or she wants to inspire change from within an established, large organization or industry. One man or woman can sink an organization or brand alone, but I doubt the resulting consequences and reputation will be worth it.
Cruise ships have many amenities and benefits worth the ride. You can really travel through life in style in a reputable large organization. If the company treats you well enough, it may be worth the complacency of a vacationing passenger. But do not expect to change anything you do not favor from within the bureaucracy.
If you truly want to make a difference on your own in your field, consider building a faster raft and inspiring the cruise ship to keep up. Competition may be the only key to making a difference and steering a large ship.